3.8 97 pontiac grand prix engine over heats when driving in stop and go traffic or slow traffic 30 miles per hour or less.I've checked radiator fans,both run, coolant is good .Replaced radiator...
The only next logical step is to have the radiator flushed and cleaned. Over time the radiator slowly builds up deposits along the fins and reduces water flow and heat dissapation. Sometimes Iv'e seen radiators get so full of deposits that only half the radiator is actually working. I have also seen this motor in other GM applications have computer problems and the cooling fans won't run when they should, but when this happens you start to see other funny stuff happening that gets hard to explain till a bad cumputer gets diagnosed. I assume everything else on the engine and car is working fine and your not noticing any other strange behavior from the engine, like hard to start sometimes and other times it starts fine, air conditioning fans work and then they quite and then work again for no apperent reason. If these type things are happening you might want to make sure your computer is working fine, and all the relays are working. Also make sure you do not have any abstructions in front of the radiator blocking air flow. there is also a sensor on top of the plennum that tells the fans to kick on, check this also.
Nov 17, 2010 |
1997 Pontiac Grand Prix